Ignitron Mercury Arc Rectifier Tube from Japan
Ignitrons are large mercury arc rectifier tubes used for high-current DC power conversion in industrial applications like aluminum smelting. HTS 8540.89.00 includes these mercury vapor-filled tubes operating via cathode-initiated arc discharge.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Mercury content declarations mandatory; special hazardous waste handling procedures
• Ozone-depleting substances certification required for mercury vapor tubes
• Legacy equipment replacement; verify if solid-state rectifiers under 8536 more appropriate